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    <script>
 
 
 
 
        class Humen extends Array {
 
        }
        var a = new Humen()
        console.log(a)
 
 
        //1.class
        //2.extends    super
        //3.#
        //4.原型上的属性
        //5.static
 
 
        //设计模式
        //1.观察者模式
        //2.单例模式
        //3.发布订阅者模式
 
 
    </script> 
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